PDS (uses dynamic allocation OS SVC 99) vs RFS:
If SVC 99 is used excessively in CICS, performance degradation may/will result. RFS datasets may be placed in CICS data tables for performance considerations.
RFS vs EXECLOAD:
Use EXECLOAD via start-up or profile execs for pre-loading common and/or heavily used execs.
REXX/CICS interpreted execs vs compiled COBOL, assembler, etc.:
Use compiled code for performance critical applications or critical application segments.
Server execs vs nested (in-stream) execs:
Server execs can process multiple client requests and typically have a shorter path length, provide better response time, and often use less system resources.
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